Ajax in Oracle JDeveloper by Deepak Vohra PDF

By Deepak Vohra

ISBN-10: 3540775951

ISBN-13: 9783540775959

ISBN-10: 354077596X

ISBN-13: 9783540775966

Asynchronous JavaScript and XML (Ajax) is an internet method used to move information among a browser and server asynchronously with out posting the internet web page to the server. "Asynchronously" signifies that the processing of the internet web page maintains whereas the Ajax request is distributed to the server and a reaction is got from the server. the internet web page, or section(s) of the net web page, is refreshed with the Ajax reaction with no reposting the internet web page. Ajax has the next benefits over non-Ajax net applications.

- diminished reaction time and diminished server load, because the whole website isn't really reposted.

- decreased bandwidth of net purposes as in basic terms info is transferred and the HTML structure is utilized within the browser.

- Separation of information, structure and elegance.

The e-book covers net seek and RSS Feed with Ajax in addition to shape validation with Ajax frameworks for Java, JSP, JSF, and Hypertext Preprocessor. It discusses utilizing Ajax in Oracle JDeveloper and is IDE established. JDeveloper has the subsequent benefits over Eclipse IDE.

- JDeveloper 11g presents an built-in JavaScript Editor for Ajax/Web improvement.

- It additionally offers a Hypertext Preprocessor extension.

- JDeveloper has a integrated aid for JSF and for JDBC.

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Jsp JSP provides the client side of the Ajax web application. jsp for redirecting client application based on if the Ajax web application generates an error in creating a catalog entry. js with File>New. In the New Gallery window select Web Tier>HTML in Categories and JavaScript File in Items and click on OK as shown in Fig. 4. 22 2 Developing an Ajax Web Application Fig. js and click on OK. js gets added to Application Navigator. For server side processing, add a HTTP Servlet with File>New. In the New Gallery window select Web Tier>Servlets in Categories and HTTP Servlet in Items and click on OK as in Fig.

In the doGet method, retrieve the value of the catalogId parameter. getParameter(“catalogId”); To obtain data from the database, create a JDBC connection from a datasource. Create a DataSource object using an InitialContext object lookup and from the DataSource object obtain a Connection object. getConnection(); Create a Statement object, specify a SQL query to retrieve data from the database for the catalogId value specified in the input form, and obtain a ResultSet object with the executeQuery(String query) method of the Statement object.

In the processRequest function, the readyState property value is retrieved to determine if request has loaded completely and if HTTP status is “OK”. 4 Processing an Ajax Request on the Server Side To the server an Ajax request is just like any other HTTP request. In this section, the server side processing of the XMLHttpRequest request sent to the server is discussed. catalogId=catalogId. Variable catalogId is the value of parameter catalogId. As the FormValidationServlet is mapped to url validateForm, the servlet gets invoked.

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Ajax in Oracle JDeveloper by Deepak Vohra

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